Synthesis, Electrochemistry, and Photophysical Properties of a Series of Luminescent Pyrene-Thiophene Dyads and the Corresponding Co₂(CO)₆ Complexes

Abstract

A series of pyrene based dyad systems together with their dicobalt hexacarbonyl complexes (1b-6b) were synthesized. The pyrene-thiophene dyads are luminescent in room temperature solution with luminescence lifetimes on the nanosecond time scale. At room temperature the dyad emission is quenched by coordination to a Co(2)(CO)(6) moiety via an acetylene bridge. However, at 77 K this emission is not fully quenched following complexation. Electrochemical studies suggest that an intraligand state is responsible for the emission. Photochemical studies in the presence of PPh(3) indicate that CO loss occurs following broadband irradiation with lambda(exc) > 400 nm, resulting in the formation of both -pentacarbonyl and -tetracarbonyl photoproducts.

Palladium(ii) complexes with thiosemicarbazones derived from pyrene as topoisomerase IB inhibitors

“…Furthermore, the intercalating properties of pyrene can be used to inhibit cellular DNA replication. 13,14 Hence, thiosemicarbazone ligands containing a pyrene moiety (Chart 1) might be promising to achieve metal complexes with mechanisms of action different from cisplatin, making them potentially active against platinum-resistant cell lines.…”

Syntheses, structures, and properties of two mononuclear cobalt(III) azido complexes containing a tetradentate N-donor Schiff base as end-capping ligand

“…The study of mono-, di-, and polynuclear complexes of cobalt in its varied oxidation states has been a topic of current research because of their interesting synthetic, structural, spectroscopic, magnetic, and optoelectronic features [1][2][3][4][5]. The essential prerequisites for such research are the judicious choice [6] of organic spacers and inorganic/organic terminals/bridges that may lead to properties of interest.…”

Incorporating Cobalt Carbonyl Moieties onto Ethynylthiophene-Based Dithienylcyclopentene Switches. 1. Photochemistry

“…The Co 2 (CO) 4 (dppm) analogues were chosen, as the photochemical stability usually increases when a carbonyl ligand is substituted with a phosphine. 40 In the case of 5Ho or 5Fo, cyclization was not observed upon irradiation at 313 or 365 nm, and significant decomposition was observed. Cyclization upon irradiation with UV light was observed for 6Ho, albeit accompanied by some decomposition of the cobalt carbonyl units.…”